Amplifier coil and connection



Feb. 2 1926. 1,571,490

, E. B. MYERS AMPLIFIER COIL AND CONNECTION Filed Dec. 24, 1921 65 Aim 1 Q) \h INVENTOR OZ/MM Qvt ATfORNEY Patented Feb. 2, 1926,

UNITED STATES ELMAN B. MYERS, or IBELLEVILLE, NEW JERSEY, ASSIGNOR T0 RADIO numoiv an.

m 11,571,490 PATENT OFFICE.

PANY, OF JERSEY CITY, NEW JERSEY, CORPORATION 'OF DELAWARE.

AMPLIFIER COIL AND CONNECTION.

Application filed December 24, 1921. Serial No.'524,789.

. To all 'wlwmit may concern: I

Be it known that I, ELMAN B. MYERS, a citizen of the United States, residing at Belleville, county of Essex, and State of New Jersey, have made a certain new and useful Invention in Amplifier Coil and Connection, of which the following is a specification.

This'invention relates to electrical coils and more particularly to the structure of an A further object of the invention isv to provide an electrical coil which is simple in construction, eflicient in operation and economical of manufacture.

A further object'of the invention is to provide such a coil especially adapted for use as an amplifier coil; 1 I

A further object of the invention is tr: provide simple and eflicient means to enable the coil to be inserted and detached from the circuit employed in connection therewith and wherein a receptacle is employed to effect this result.

Other objects of the invention will appear more fully hereinafter.

The invention consists substantially in the construction, combination, location and relative arrangement of parts, all as will be more fully hereinafter set forth, asshown in the accompanying drawing, and, finally pointed out in the appended claims.

Referring to the drawing:

Fi re 1 is a view in elevation of an amplifier and its receptacle embodying m3 invention. 4

Fi 2 is a broken enlarged central sectiona view.

Fi 3lis a view in perspective of a termina employed in connection therewith.

Fig. 4 is a top plan view of the coil in its receptacle.

The same part is designated by the same reference character wherever it occurs throughout the several views.

In accordance with my invention I employ a shell, preferably formed of two halves, 1 and 2, which are provided with interior tapering bores, the taper being towards the closed end thereof, the open ends thereof being adapted to abut against each other, as clearly shown in Figs. 1 and 2.

The coil consists of an iron Wire'core 3 upon whlch 1s wound, the wire 4, the ter minals 5 thereof passing through and being soldered to the terminal 6, which will be more fully hereinafter described. As will be apparent, the shell halves, when assembled, completely enclose the coil and the closed ends of the shell halves are supplied with a suitable cement such as condensite cement, illustrated at 7 The terminal wire 5 is embedded in the condensite cement and the opening in the contact plate 6 through which thewire 5 passes is sealed with this cement. The cement covers the entire end of the coil and firmly holds the coil to'the end of the shell and serves to close the hole in the clip. The twohalves of the shell 1 and 2 are similarly. cemented together as at 8, sufficient cement being employed to center the coil in the shell. Due to the tapering bore in the shell halves which, atthe respective bottoms thereof, is of the same diameter as the diameter of the coil, the shellhalves may be quickly and easily placed in alignment which .permits making a straight, smooth and close joint between the shell parts. When thecoil has been centered in the shell and the shell parts cemented, the assembled unit is then clamped in a jacket and placed a heated oven to bake the'cement. It is advisable, when the unit thus formed is cooled, to retain it clamped in the jacket. Thus, when the unit is cooled and the cement is set, the coil will be hermetically sealed in. a shell of condensite thereby obtaining a coil unit which is fully and permanently protected from moisture, dust, etc., and which will not be affected by normal changes in atmospheric conditions. The terminal pieces or blades employed and shown in perspective in Fig. 3, are in the form of a metal contact blade, one at each end of the coil and moulded into the shell pieces. These blades are made of strip' metal and have two indentations 9 formed therein and are then bent to form blades of double thickness, as shown, with the indentations opposed to each other and the edges 10 thereof rounded, as shown. In bending the strip into the form shown the ends are brought together at or about the point shown at X so that when imbedded in the shell pieces the joint will not be exposed.

The two indentations opposing each other form the central opening throu h which the wire terminal 5 extends and a ords simple means for soldering the wire thereto after the coil has been inserted in the shell and the condensite cement 7 applied. In prac tice I prefer to provide the blades with two small indentations 9' to insure firm anchoring when molded in place. This form of terminal or contact blade avoids all machining and imparts to the blades the rounded edges 10 which engage the spring clips of the receptacle, to be hereinafter described. The shell halves 1 and 2, when formed, are provided with wedge members 11 extending thereacross at the end of the shell piece, and the contact blade 6 is positioned to extend transversely across the wedge 11. The wedges, in addition to forming a seat for the contact blade '6, also serve to spread the contact clips employed on the receptacle when inserting the coil into the receptacle and also to prevent the coil turning between the clips and thereby breaking the contact after the coil has been inserted in the receptacle.

I will now describe the receptacle which may be employed to advantage with this type of coil, although the present invention is not directed to the receptacle construction, as the same forms the subjectmatter of a separate application for patent and is substantially identical in construction with receptacles being used in connection with vacuum tube devices such as audions. In view thereof, I do not desire to be limited or restricted to the particular construction of receptacles used except in so far as it cooperates with the coil of my invention to afford a completion of the electrical circuit in which the coil is used. In the form shown, however, the receptacle consists substantially of a plate 12 provided with two or more terminals 13 to which wires may be led from any desired direction through openings 14' suitably provided at the edges of the receptacle, the connection may be made directly to the terminals 13, if more convenient. Plate 12 is adapted to be suitably secured to a panel board or a piece of apparatus by means of screws passing through holes 15. The plate 12 supports contacting clips 16. which are in circuital connection with the terminals 13. The clips are each indented, as shown, and

- extend outwardly from the face of the plate 12, the ends thereof being outwardly flared from each other to facilitate insertion of the coil contact blades 6 therein. It will beapparent that all thatis necessary to do to insert the coil in the circuit in which it is desired to use the same, is to connect I the two opposite terminals 13, that is, one

. terminal at each end of the plate 12 with the ends of the circuit, and'insert between the contact clips 16, and with slight pressure the wedges 11 will spread the clips apart until the rounded edges 10 of the contact blades seat in the indentations in the clips, thereby'securing an eflicient connection between the terminals.

Many modifications and changes in details will readily occur to those skilled in the art without departing from the spirit and scope of my invention as defined in the claims. But having now set forth the objects and nature of my invention, and having shown and described a construction embodying the principles thereof, what I claim as new and useful and of m own invention, and desire to secure by etters Patent is:

1. The combination with an amplifier coil, of a shell formed in two halves, enclosing said coil and hermetically sealing the same therein, and a. terminal blade at the end of each shell-half secured to the coil terminals.

2. The combination with an amplifier coil, of a shell formed in. two halves, each formed with a tapering bore therein, said tapering bore serving to center the coil and insure alignment of the shell halves, and said shell halves being secured together to hermetically seal said coil therein.

V 3. The combination with an amplifier coil, of a shell formed in two halves, eachterminal formed of a plate of metal bent upon itself to form rounded edges and carried by said shell so as to have the rounded edges project therefrom, and means for hermetically sealing a coil in said shell with electrical connection between said coil and said terminal. I

5. In a coil structure, a shell, an electric terminal formed of a plate of metal bent upon itself to form rounded edges and embedded in a shoulder formed on the end of said shell to extend transversely thereacross and project therefrom, and means for hermetically sealing a coil in said shell with cirlcuit connection thereto from said termina 6. In a coil structure, a shell, an electric terminal formed of a plate of metal bent uponitself to form rounded edges and a central orifice, said terminal being carried by said shell so as to have the rounded edges project therefrom, and means for hermetically sealing a coil in said shell with circuit connection between the coil and said terminal at the central orifice thereof.

7. In a coil structure, a shell, an electric terminal formed of a plate of metal bent upon itself to form rounded edges and carried by said shell so as to have the rounded edges project therefrom, 'means for hermetically sealing a coil in said shell with electrical connection between said coil and said terminal, and a receptacle for said coil and shell provided with means for engaging said tefminals to establish electrical contact and to support said coil and shell.

8. In a coil structure, a shell, .an electric terminal formed of a plate of metal bent upon itself to form rounded edges and carried by said shell so as to have the rounded edges project t,herefrom,'means for hermet ically sealing a coil in said shell with electrical connection between said coil and said terminal, and a receptacle for said coil andshell provided with spring clips for engagterminal formed of a plate of metal bent upon itself to form rounded ed es and carrled by said shell, means for ermetically sealing a coil in said shell with electrical connection betweensaid coil and said ter-. minal, and a receptacle for said coil and shell provided with spring clips having notches for engaging said terminals to es tablish electrical contact coil structure, I

10. In a coil structure, a shell, an electric terminal formed of a plate of metal bent upon itself to form rounded ed s and carried by said shell, means for. ermetically sealing a coil in said shell with electrical and to support said connection between said coil and said terminal, and a receptacle for said coil and shell provided with spring clips having notches and outwardly flaring ends for engaging said terminals to establish'electrical contact and to support said coil structure.

11. A contact blade formed from a metal strip having two lateral indentations, said strip being folded upon itself to form a blade of double thickness with said indentations opposite each other and forming a central opening through the blade, and said blade having rounded edges imparted thereto at each bend .or fold.

12. A contact blade formedfrom a metal strip having two lateral indentations, said strip being folded upon itself to form a blade of double thickness with said indentations opposite each other and forming a central opening through the blade, and said to at each bend or fold, and said folded strip being provided with one or more anchoring indentations.

13. A contact blade formed from a metal strip having two lateral indentations, said strip being folded upon itself to form a blade of double thickness with said indentations opposite each other and forming a central opening throu h the blade, said blade having rounded e ges imparted thereto at each bend or fold, and the meeting ends of the folded strip being at or near the indentations forming the central opening. I

In testimony whereof I have hereunto set my hand on this 20th day of December A. 1)., 1921.

ELMAN B. MYERS. 

